Disorder, inhomogeneity and spin dynamics in f-electron non-Fermi liquid systems

Details Disorder, inhomogeneity and spin dynamics in f-electron non-Fermi liquid systems Disorder, inhomogeneity and spin dynamics in f-electron non-Fermi liquid systems

2004-04-06

arxiv.org/abs/cond-mat/0404118v1

Physics

Condensed Matter

Strongly Correlated Electrons

24 pages, 15 figures, submitted to J. Phys.: Condens. Matter

Scientific paper

10.1088/0953-8984/16/40/005

Muon spin rotation and relaxation ($\mu$SR) experiments have yielded evidence that structural disorder is an important factor in many f-electron-based non-Fermi-liquid (NFL) systems. Disorder-driven mechanisms for NFL behaviour are suggested by the observed broad and strongly temperature-dependent $\mu$SR (and NMR) linewidths in several NFL compounds and alloys. Local disorder-driven theories (Kondo disorder, Griffiths-McCoy singularity) are, however, not capable of describing the time-field scaling seen in muon spin relaxation experiments, which suggest cooperative and critical spin fluctuations rather than a distribution of local fluctuation rates. A strong empirical correlation is established between electronic disorder and slow spin fluctuations in NFL materials

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